The utility model relates to a tunnel engineering such as railway, highway excavation supporting construction field specifically is a tunnel construction structure suitable for complex environment hunch portion exposes. The problem of tunnel construction safety can excavate under the complex environment is solved, steelframe including setting up at face the place ahead country rock is strutted, and the steelframe is strutted both sides and is equipped with leading tub of canopy, and the still radial lock foot pipe canopy that sets up of fixedly connected with of both sides is strutted to the steelframe, and fixed connection is strutted through lock foot anchor pipe and steelframe to lock foot pipe canopy one end, and the lock foot pipe canopy other end is inserted and is established in the country rock. The utility model discloses can guarantee to expose tunnel excavation construction safety in hunch portion.